CVE-2025-27516

Published Mar 5, 2025

Last updated 4 months ago

CVSS medium 5.4

Overview

Description
Jinja is an extensible templating engine. Prior to 3.1.6, an oversight in how the Jinja sandboxed environment interacts with the |attr filter allows an attacker that controls the content of a template to execute arbitrary Python code. To exploit the vulnerability, an attacker needs to control the content of a template. Whether that is the case depends on the type of application using Jinja. This vulnerability impacts users of applications which execute untrusted templates. Jinja's sandbox does catch calls to str.format and ensures they don't escape the sandbox. However, it's possible to use the |attr filter to get a reference to a string's plain format method, bypassing the sandbox. After the fix, the |attr filter no longer bypasses the environment's attribute lookup. This vulnerability is fixed in 3.1.6.
Source
security-advisories@github.com
NVD status
Modified
Products
jinja, debian_linux

Risk scores

CVSS 4.0

Type
Secondary
Base score
5.4
Impact score
-
Exploitability score
-
Vector string
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Severity
MEDIUM

CVSS 3.1

Type
Primary
Base score
8.8
Impact score
6
Exploitability score
2
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Severity
HIGH

Weaknesses

security-advisories@github.com
CWE-1336

Social media

Hype score
Not currently trending

  1. Just published: Deep dive on the #SUSE Jinja2 vulnerability (CVE-2025-27516). Read more: 👉 https://t.co/Ul3uGBdqw0 #Security https://t.co/AY0zyaHvI4

    @Cezar_H_Linux

    10 Dec 2025

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  2. CVE-2025-27516 Jinja is an extensible templating engine. Prior to 3.1.6, an oversight in how the Jinja sandboxed environment interacts with the |attr filter allows an attacker that … https://t.co/46pgh3utfz

    @CVEnew

    6 Mar 2025

    30 Impressions

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  3. CVE-2025-27516 Jinja Sandbox Bypass Vulnerability Allows Arbitrary Python Code Execution Before 3.1.6 https://t.co/FxwcU7e5Oo

    @VulmonFeeds

    6 Mar 2025

    6 Impressions

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Configurations

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References

Sources include official advisories and independent security research.